Apparatus and method for sensing a current leakage of a battery, and battery driving apparatus and battery pack including the apparatus

Abstract

The present invention relates to an apparatus and to a method for sensing a current leakage of a battery, and to a battery driving apparatus and to a battery pack including the apparatus. The apparatus for sensing a current leakage of a battery according to the present invention includes: a floating capacitor for storing voltages detected from an anode terminal or a cathode terminal of a battery; a DC voltage applying unit for applying DC voltage to the cathode terminal when the voltage detected from the cathode terminal of the battery is measured; a terminal selection switching unit for selecting a voltage detection path of the anode terminal or the cathode terminal; a charging switch unit for charging the floating capacitor with the detected voltage of the anode terminal or the cathode terminal detected from the selected voltage detection path, and separating the floating capacitor from the voltage detection path; a voltage sensing unit for sensing the detected voltage of the anode terminal or the cathode terminal of the battery charged in the separated floating capacitor; and a current leakage determination unit for calculating a leakage resistance by using the detected voltage of the anode terminal and the cathode terminal of the battery sensed by the voltage sensing unit, and determining whether or not a current leakage has occurred through the comparison of the calculated leakage resistance and a reference insulation resistance.

Description

technical field [0001] The present invention relates to an apparatus and method for sensing a leakage current of a battery, and more particularly to an apparatus and method for sensing a leakage current of a battery employed in a battery power supply system requiring a high voltage, such as an electric vehicle and a hybrid vehicle. method. Background technique [0002] Recently, with the exhaustion of fossil fuels and environmental pollution, electric vehicles or hybrid vehicles (hereinafter, collectively referred to as electric vehicles) that can be driven by batteries without using fossil fuels have become more attractive. [0003] Most batteries used for electric vehicles are secondary batteries. Secondary batteries are classified into lithium series batteries and nickel hydrogen series batteries. Lithium series batteries are mainly applied to small-sized products such as digital cameras, P-DVD, MP3P, cellular phones, PDAs, portable game devices, electric tools and elec...

AI Technical Summary

Problems solved by technology

Poor insulation of the battery causes leakage current, which leads to various problems

For reference, leakage current of the battery causing accidental discharge of the battery, or failure of electronic equipment included in the device

Also, the leakage current of batteries used in equipment using high-voltage batteries such as electric vehicles can cause fatal electric shocks to people

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